Method and means of reading punched data tape

Details Method and means of reading punched data tape Method and means of reading punched data tape

1979-08-06

1983-02-08

Robinson, Thomas A.

Telegraphy

Systems

Automatic

235455, 3401463AG, G06K 710, G08C 906

Patent

active

043731147

ABSTRACT:
A photoelectric circuit for reading punched data tape wherein the circuit compensates for variations in phototransistors and light emitting diodes, dust accumulation and degradation of the light emitting diodes by comparing the light transmitted through a punched section of the tape to the light transmitted through a solid section of the tape.

REFERENCES:
patent: 3549867 (1970-12-01), Malone
patent: 3560751 (1971-02-01), Buettner et al.
patent: 3820068 (1974-06-01), McMillin
patent: 4162408 (1979-07-01), Hansen
patent: 4243876 (1981-01-01), Engel et al.

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